Automatic vibrating circuit-breaker.



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E. B. CRAFT. AUTOMATIC VIBRATING CIRCUIT BREAKER. APPLICATION FILED 001. 24, 1010.

Patented Aug.26,1913.

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UNITED STATES PATENT OFFICE.

EDWARD B. CRAFT, OF HACKENSACK, NEW JERSEY, ASSIG-NOR TO WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

AUTOMATIC VIBRATING CIRCUIT-BREAKER.

Specification of Letters Patent.

Application'filed October 24, 1910. Serial No. 588,842.

To all whom it may concern Be it known that I, EDWARD CRAFT, a citizen of the United States, residing at Hackensack, in the county of Bergen and State of New Jersey, have invented a certain new and useful Improvement in Automatic Vibrating Circuit-Breakers, of whichthe following is a full, clear, concise, and exact description.

This invention relates to automatic vibrating circuit breakers such as are employed in connection with induction'coils.

The object of the invention is to provide a simple, cheaply constructed and durable vibrating circuit breaker with means for attaining a fine adjustment and retaining such adjustment in spite of the jarring action of the vibratory element.

In the accompanying drawings Figure 1 is a vertical cross-section of an induction coil having the novel arrangement of vibratory circuit breaker. Fig. 2 is a top plan view thereof the boX being omitted. Fig. 3 is an elevation of what is shown in Fig. 2. Fig. 4 shows the armature with the sheet metal resilient support, its tongue and bifurcated terminal, theinoxidizable contact carried on the armature and the tongue cut from the armature in positionto engage the terminal of the contact. Fig. 5 shows the bifurcated strips with its crimped edge to engage the serrations of the adjusting screw as it is employed in Fig. 3.

The core of the induction coil is shown at i mounted in the plate 7' of insulating material forming the top of the spark coil unit and upon which the parts of the armature structure are mounted. The armature a comprises a sheet of magnetic material having a tongue Z) bent up out of the plane of the armature into a parallel plane, as shown.

The vibrating contact 0 of inoxidizable metal is riveted to the armature at 10, the free end of said contact being located between the body of the armature and the tongue- 6, as best shown in Figs. 1 and 4. The resilient support, for the armature ,(1 consists of a sheet of spring metal (5, which is cut or slitted to form a tongue e and a terminal f. This terminal is bifurcated and at the junctions of the two limbs it is crimped as at 12. The sheet metal support at is clamped upon a block 13 mounted on the plate j and having a ridge or edge 14,by

means of a superposed plate 15 and screws 16. These screws 16 pass through the perforations 17 in the support d. An adjusting screw 30 is screw-threaded into the plate 15 passing between thebifurcations of f, its terminal being in engagement with the tongue 6. Screw 30 has a row of serrations s "on the under side of the thumbpiece t, and the crimp 12 is held in engagement with these serrations. The fixed contact 18 which cooperates with the vibrating contact 0 is formed on the end of the screw a which passes through the bridge member 19 secured to the plate j, as shown. On the bottom of the thumb piece of the screw it are serrations .9 similar to the serrations of the screw 30. Cooperating with the serrations s is a bifurcated spring holding device, shown in Fig. 5, comprising leaves 7,- f, connected by a crimped portion 12; the ends of the leaves f, f rest on the bridge member 19, and the crimped portion 12 cooperates with the serrations s, as best shown in Fig. 3. The induction coil 2' is contained in a case or box 20 having binding screws 21 and a socket 23 with which electrical connections may be made. Flat contact springs 22 are shown and serve to retain the induction coil in position; they may also be the means of connecting the terminals of the induction coil with binding posts in a manner old in the art.

In the operation of the apparatus the normal separation of the armature with respect to the magnet pole and the fixed contact 18 is adjusted by means of the adjusting screw 30 which abuts against the tongue 6. Screw 30 is retained against any turning force less than that applied by the hand, by reason of its engagement with the crimp 12 in the bifurcated terminal f. The position of the fixed contact 18 is adjusted by means of a screw it retained by a bifurcated holding device f. The resilient support 03 is cheaply constructed and is effective for the purpose intended.

What I claim is:

1. The combination in an electromagnetic vibratory circuit breaker, ofa resilient member clamped at one end, of an armature carried by the free end of said resilient member,

a movable contact carried by said armature cooperating with a fixed contact, an adjusting screw engaging sald resilient member to Patented Aug. 26,1913. 7

the combination of an armature, a support plying pressure'to said tongue to vary the normal space between said cont-acts.

4. In apparatus of the described character the combination of a support for the armature consisting of a sheet of resilient metal cut to form a projecting tongue, a block having a ridge upon which said support is clamped, a fixed contact, a movable contact carried by said armature, a screw for applying pressure to said tongue to vary the nor mal space between said contacts, serrations on said screw, a bifurcated stripformed from said supporting sheet of metal, having a crimp at the junction of the limbs, said serrations on said screw being held in engagement with said crimp.

In witness whereof I, hereunto subscribe October A. D.,

vary the normal space between said contacts, and means integral with said resilient member for retaining said adjusting screw in an adjusted position.

2. The combination in an electromagnetic vibratory circuit breaker, of an armature and a support therefor consisting of a sheet of resilient metal secured to said armature and cut to form a projecting tongue, means for supporting said sheet metal support, a fixed contact, a movable contact cooperating with said fixed contact and carried by said armature, and an adjusting screw for applying variable pressure to said tongue to vary the normal space between said contacts.

"3. In apparatus of the described character for the armature consisting of a sheet of remy name this 22nd day of silient metal secured to said armature and 1910. cut to form a projecting tongue, a block hav- EDWARD B. CRAFT. ing a ridge upon which said support is Witnesses:

IRVING MACDONALD,

a movable contact MOR AN WASHBURN, Jr.

clamped, a fixed contact,

and means for apcarried by said armature, 

